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Working position measuring system

  • US 7,110,102 B2
  • Filed: 12/10/2003
  • Issued: 09/19/2006
  • Est. Priority Date: 12/26/2002
  • Status: Active Grant
First Claim
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1. A working position measuring system, comprising a rotary laser device for irradiating and rotating a laser beam and a photodetection sensor device for receiving the laser beam and for detecting a working position, wherein said rotary laser device comprises a laser projector for projecting at least two fan-shaped beams with at least one beam tilted, and a rotator for irradiating and rotating said fan-shaped beams, and said photodetection sensor device comprises at least one photodetection unit for receiving said fan-shaped beams, and a GPS position measuring device in a predetermined positional relation with said photodetection unit, and for detecting a position of said photodetection sensor device, a storage unit for storing positional information of said rotary laser device and an arithmetic unit, wherein said arithmetic unit obtains a distance from said rotary laser device to said photodetection device from said stored positional information and the detected position of said GPS position measuring device, calculates an elevation angle relative to said rotary laser device based on photodetection signals produced when said photodetection unit receives the light beam, and obtains a height of said photodetection sensor device from said elevation angle and said distance.

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